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WMO, No. 407 International Cloud Atlas, Volume II
·..- INTERNATIONAL CLOUD ATLAS Volume 11 WORLD METEOROLOGICAL ORGANIZATION 11"]~ii[Ulilliiill~lllifiiilllll INTERNATIONAL CLOUD ATLAS Volume 11 11'-;> oz-; WORLD METEOROLOGICAL ORGANIZATION 1987 © 1987, World Meteorological Organization ISBN 92 - 63 - L2407 - 8 NOTE The designations employed and the presentation of material in this publication do not imply the expression of any opinion whatsoever on the part of the Secretariat of the World Meteorological Organization concerning the legal status of any country, territory, city or area, or of its authorities, or concerning the delimitation of its frontiers or boundaries. The photographs contained in this volume may not be reproduced without the authoriza tion of the copyright owner. All inquiries regarding reproduction rights should be addressed to the Secretary-General, World Meteorological Organization, Geneva (Switzerland). 03- 4365 v'Z, c ~~ FOREWORD With this new, thoroughly revised edition of Volume 11 of the Study of Clouds. A modified edition of the same work appeared in International Cloud Atlas a key publication is once again made 1939, under the title International Atlas 0/ Clouds and of Types 0./ available for professional meteorologists as well as for a wide circle of Skies, Volume I, General Atlas. The latter contained 174 plates: IQ I interested amateurs. For meteorologists this is a fundamental hand cloud photographs taken from the ground and 22 from aeroplanes, and book, for others a source of acquaintance with the spectacular world of 51 photographs of types of sky. From those photographs, 31 were clouds. printed in two colours (grey and blue) to distinguish between the blue The present internationally adopted system of cloud classification of the sky and the shadows of the clouds. -
Cloud Atlas? 5
Episode 9 Teacher Resource 4th April 2017 Clouds 1. Briefly explain how clouds form. Students will develop an 2. Why are clouds an important part of the earth’s atmosphere? understanding of how clouds form and the different types of clouds. 3. What does a meteorologist study? 4. What is a Cloud Atlas? 5. When was it first published? 6. What does a cumulus cloud look like? 7. What is the name of the cloud that brings rain and lightning? 8. The Cloud Atlas has special clouds that are defined by the unusual Science – Year 4 ways they form. Give an example of one. Represent and communicate observations, ideas and findings 9. Describe the cloud that Gary helped get into the Cloud Atlas. using formal and informal 10. What do you understand more clearly since watching the BTN representations (ACSIS071) story? Science – Year 5 Solids, liquids and gases have different observable properties a nd behave in different ways (ACSSU077) Science – Year 7 Class Discussion Some of Earth’s resources are Watch the BTN Cloud Atlas story and discuss the information raised as a renewable, including water that cycles through the environment, class. What questions do students have (what are the gaps in their but others are non-renewable knowledge)? The following questions may help guide the discussion: (ACSSU116) What are clouds? Come up with a definition. What have you noticed about clouds? How do clouds form? What are the main types of clouds? What is the Cloud Atlas? The following KWLH organiser provides students with a framework to explore their knowledge on this topic and consider what they would like to know and learn. -
Aerosols, Their Direct and Indirect Effects
5 Aerosols, their Direct and Indirect Effects Co-ordinating Lead Author J.E. Penner Lead Authors M. Andreae, H. Annegarn, L. Barrie, J. Feichter, D. Hegg, A. Jayaraman, R. Leaitch, D. Murphy, J. Nganga, G. Pitari Contributing Authors A. Ackerman, P. Adams, P. Austin, R. Boers, O. Boucher, M. Chin, C. Chuang, B. Collins, W. Cooke, P. DeMott, Y. Feng, H. Fischer, I. Fung, S. Ghan, P. Ginoux, S.-L. Gong, A. Guenther, M. Herzog, A. Higurashi, Y. Kaufman, A. Kettle, J. Kiehl, D. Koch, G. Lammel, C. Land, U. Lohmann, S. Madronich, E. Mancini, M. Mishchenko, T. Nakajima, P. Quinn, P. Rasch, D.L. Roberts, D. Savoie, S. Schwartz, J. Seinfeld, B. Soden, D. Tanré, K. Taylor, I. Tegen, X. Tie, G. Vali, R. Van Dingenen, M. van Weele, Y. Zhang Review Editors B. Nyenzi, J. Prospero Contents Executive Summary 291 5.4.1 Summary of Current Model Capabilities 313 5.4.1.1 Comparison of large-scale sulphate 5.1 Introduction 293 models (COSAM) 313 5.1.1 Advances since the Second Assessment 5.4.1.2 The IPCC model comparison Report 293 workshop: sulphate, organic carbon, 5.1.2 Aerosol Properties Relevant to Radiative black carbon, dust, and sea salt 314 Forcing 293 5.4.1.3 Comparison of modelled and observed aerosol concentrations 314 5.2 Sources and Production Mechanisms of 5.4.1.4 Comparison of modelled and satellite- Atmospheric Aerosols 295 derived aerosol optical depth 318 5.2.1 Introduction 295 5.4.2 Overall Uncertainty in Direct Forcing 5.2.2 Primary and Secondary Sources of Aerosols 296 Estimates 322 5.2.2.1 Soil dust 296 5.4.3 Modelling the Indirect -
New Cloud Types 2019
UPSC MAIN & PRELIMS NEW CLOUD TYPES 2019 BY : NEETU SINGH This is updated material for New Cloud Types, targeting both upcoming Prelims and Main Exams. Video is attached to provide you with the gist of content. https://youtu.be/01Ciwd9b470 New Cloud Types PRINCIPLES OF CLOUD CLASSIFICATION Useful concepts Height, altitude, vertical extent Clouds continuously evolve and appear in an infinite variety of forms. However, there is a limited number · Height: Vertical distance from the point of of characteristic forms frequently observed all over observation on the Earth's surface to the point the world, into which clouds can be broadly grouped being measured. in a classification scheme. The scheme uses · Altitude: Vertical distance from mean sea level to genera(defined according to their appearance and the point being measured. position in the sky), species(describing shape and · Height/Altitude of cloud base: For surface structure) and varieties(describing transparency and observations, height of the cloud base above arrangement).This is similar to the systems used in ground level; for aircraft observations, altitude of the classification of plants or animals, and similarly the cloud base above mean sea level. uses Latin names. · Vertical extent: Vertical distance from a cloud's There are some intermediate or transitional forms of base to its top. clouds that, although observed fairly frequently, are Levels not described in the classification scheme. The transitional forms are of little interest; they are less Clouds are generally encountered over a range of stable and in appearance are not very different from altitudes varying from sea level to the top of the the definitions of the characteristic forms. -
ESSENTIALS of METEOROLOGY (7Th Ed.) GLOSSARY
ESSENTIALS OF METEOROLOGY (7th ed.) GLOSSARY Chapter 1 Aerosols Tiny suspended solid particles (dust, smoke, etc.) or liquid droplets that enter the atmosphere from either natural or human (anthropogenic) sources, such as the burning of fossil fuels. Sulfur-containing fossil fuels, such as coal, produce sulfate aerosols. Air density The ratio of the mass of a substance to the volume occupied by it. Air density is usually expressed as g/cm3 or kg/m3. Also See Density. Air pressure The pressure exerted by the mass of air above a given point, usually expressed in millibars (mb), inches of (atmospheric mercury (Hg) or in hectopascals (hPa). pressure) Atmosphere The envelope of gases that surround a planet and are held to it by the planet's gravitational attraction. The earth's atmosphere is mainly nitrogen and oxygen. Carbon dioxide (CO2) A colorless, odorless gas whose concentration is about 0.039 percent (390 ppm) in a volume of air near sea level. It is a selective absorber of infrared radiation and, consequently, it is important in the earth's atmospheric greenhouse effect. Solid CO2 is called dry ice. Climate The accumulation of daily and seasonal weather events over a long period of time. Front The transition zone between two distinct air masses. Hurricane A tropical cyclone having winds in excess of 64 knots (74 mi/hr). Ionosphere An electrified region of the upper atmosphere where fairly large concentrations of ions and free electrons exist. Lapse rate The rate at which an atmospheric variable (usually temperature) decreases with height. (See Environmental lapse rate.) Mesosphere The atmospheric layer between the stratosphere and the thermosphere. -
Guidance on the Harmonized WAFS Grids for Cumulonimbus Cloud, Icing and Turbulence Forecasts
Guidance on the Harmonized WAFS Grids for Cumulonimbus Cloud, Icing and Turbulence Forecasts. Version 2.5 13 September 2012 Guidance on the Harmonized WAFS Grids for Cumulonimbus Cloud, Icing and Turbulence forecasts. Contents 1. Introduction ....................................................................................................................... 2 2. General Description of Data ............................................................................................. 2 3. Description of Data Values ............................................................................................... 4 4. Grid Interpolation ............................................................................................................. 5 5. Description of the Harmonization Process ..................................................................... 5 6. Explanation of differences between the WAFS gridded forecasts for CB cloud, icing and turbulence and the WAFS significant weather (SIGWX) forecasts ............................. 6 7. Suggested usage of WAFS gridded forecasts for Cb cloud, icing and turbulence ...... 8 7.1 General principles ..................................................................................................... 8 7.2 Use of the WAFS Clear Air Turbulence (CAT) gridded forecast ........................ 8 7.3 Use of the WAFS icing gridded forecast ................................................................. 9 7.4 Use of the WAFS Cb cloud gridded forecasts ..................................................... -
Btn: Episode 09 Transcript 4/04/17
BtN: Episode 09 Transcript 4/04/17 Hi I'm Nathan Bazley and this is BTN! Coming up today A world without cash? We find out how it might happen sooner than you think. Jack takes on a 'BTN Investigates' question that's out of this world. And Kind Classrooms wraps up with a look at just some of the schools that helped make the world a better place. But first: Cyclone Debbie Reporter: Natasha Thiele INTRO: We're taking a look at the destruction caused by Cyclone Debbie last week. Soon, we'll hear all about the flooding that it caused through South East Queensland and Northern NSW. But first we'll find out what it's like to go through a cyclone from two kids that experienced it first-hand. This is the sound a powerful tropical cyclone makes when it hits your house. Those powerful winds, combined with incredibly heavy rain, destroyed homes, trees and crops along the north coast of Queensland on Tuesday. And afterwards tens of thousands of people were left without power just like Hunter and his family who live in Cannon Valley. Hunter was going to report on the cyclone for us as a Rookie Reporter, but without power it's been tough to charge up his camera or connect to the internet. REPORTER: Hey Hunter, how you going? I've heard power's been a pretty big issue over there at the moment, you've been filming some stuff for us but you can't get a lot of it through. Can you tell us what Cyclone Debbie was like? HUNTER: Well it was a devastating scene and it was really scary! REPORTER: And were you like hiding in the bathroom or what were you guys doing? HUNTER: Well at the start when it wasn't like, when the first time we were just outside in our, we were inside but then when it, after the second bit we went into our bathroom because it started getting really strong winds. -
Lightning Dr
ESCI 340 - Cloud Physics and Precipitation Processes Lesson 12 - Lightning Dr. DeCaria References: The Lightning Discharge, Uman The Electrical Nature of Storms, MacGorman and Rust Fundamentals of Lightning, Rakov `Runaway Breakdown and the Mysteries of Lightning', Gurevich and Zybin, Physics Today, 2005 Mechanisms of Charge Separation • The top of a thunderstorm (cumulonimbus) cloud becomes positively charged, while the middle-to-lower portions of the cloud becomes negatively charged. • Often there is also a smaller pocket of positive charge near the bottom of the cloud. • The reason for this charge separation is not completely understood, but some of the more prominent theories are described below. • Those mechanisms requiring a preexisting electric field are called inductive charging mechanisms, while those not requiring a preexisting electric field are called nonin- ductive charging mechanisms. Inductive ion capture: In a preexisting electrical field, there will be a separation of charge across a hydrometeor. As the hydrometeor falls, gaseous ions will either be attracted or repelled from the underside of the hydrometeor, depending on their sign. Thus, the hydrometeor will gain an increasing charge of whatever sign it has on its topside. In Fig. 1 the positive ions are repelled as the hydrometeor falls, but the negative ions are attracted. Thus, the hydrometeor gains a net negative charge as it falls. Figure 1: Inductive ion capture. 1 Ion capture may play a role in weakly electrified storms, but cannot be used to explain the amount of charge separation seen in a thunderstorm without the presence of other mechanisms. Inductive particle rebound: Two hydrometeors in a preexisting electric field, falling at different speeds, will exchange charge during collision as shown in Fig. -
ICA Vol. 1 (1956 Edition)
·wMo o '-" I q Sb 10 c. v. i. J c.. A INTERNATIONAL CLOUD ATLAS Volume I WORLD METEOROLOGICAL ORGANIZATION 1956 c....._/ O,-/ - 1~ L ) I TABLE OF CONTENTS Pages Preface to the 1939 edition . IX Preface to the present edition . xv PART I - CLOUDS CHAPTER I Introduction 1. Definition of a cloud . 3 2. Appearance of clouds . 3 (1) Luminance . 3 (2) Colour .... 4 3. Classification of clouds 5 (1) Genera . 5 (2) Species . 5 (3) Varieties . 5 ( 4) Supplementary features and accessory clouds 6 (5) Mother-clouds . 6 4. Table of classification of clouds . 7 5. Table of abbreviations and symbols of clouds . 8 CHAPTER II Definitions I. Some useful concepts . 9 (1) Height, altitude, vertical extent 9 (2) Etages .... .... 9 2. Observational conditions to which definitions of clouds apply. 10 3. Definitions of clouds 10 (1) Genera . 10 (2) Species . 11 (3) Varieties 14 (4) Supplementary features and accessory clouds 16 CHAPTER III Descriptions of clouds 1. Cirrus . .. 19 2. Cirrocumulus . 21 3. Cirrostratus 23 4. Altocumulus . 25 5. Altostratus . 28 6. Nimbostratus . 30 " IV TABLE OF CONTENTS Pages 7. Stratoculllulus 32 8. Stratus 35 9. Culllulus . 37 10. Culllulonimbus 40 CHAPTER IV Orographic influences 1. Occurrence, structure and shapes of orographic clouds . 43 2. Changes in the shape and structure of clouds due to orographic influences 44 CHAPTER V Clouds as seen from aircraft 1. Special problellls involved . 45 (1) Differences between the observation of clouds frolll aircraft and frolll the earth's surface . 45 (2) Field of vision . 45 (3) Appearance of clouds. 45 (4) Icing . -
Clouds First Midterm Exam Is Next Friday!
Clouds First midterm exam is next Friday! The exam will be in-class, during our regular lecture • on Friday September 28 at 9:35 am. The exam will be CLOSED BOOK • ♦ No textbooks ♦ No calculators ♦ No cheat-sheets • Alternate seating • The grades will be posted on WebCT • The exam covers Chapters 1,2,3,4,5, and 19. • Office hours: next Wednesday 10:30-11:30 am. RECAP Dew - condensation on cold surfaces. • Frost - deposition on very cold surfaces. • Haze - condensation on small airborne particles. • Fog – saturated wet haze, visibility <1 km. • ♦ Radiation fog – driven by radiation cooling ♦ Advection fog – driven by air movement ♦ Upslope fog - topography driven ♦ Evaporation fog – cold air above warm body of water. Clouds Definition: visible aggregate of tiny water droplets or • ice crystals suspended in air Classification: four major cloud groups according to the • height (of the cloud base). Within each group there are different types identified by their appearance ♦ High (cirrus: Latin for “wisp of hair”) •Cirrus, Cirrostratus, Cirrocumulus ♦ Middle (alto, from the Latin altus: “high”) •Altostratus, Altocumulus ♦ Low (stratus, Latin for “layer”) •Stratus, Stratocumulus, Nimbostratus ♦ Clouds with vertical extension (cumulus: ”heap”) •Cumulus, Cumulonimbus Basic Cloud Types What are the important things to know Composition: recall that in the troposphere the • temperature drops with altitude. ♦ High clouds (16,000 – 43,000 ft in midlatitudes) are made mostly of ice ♦ Middle clouds (6,500 – 23,000 ft in midlatitudes) are composed of water droplets and some ice crystals (higher up or when the temperature is low) ♦ Low clouds (surface to 6,500 ft in midlatitudes) are composed primarily of water droplets except in very cold weather when it snows For reference: commercial aircraft flies around • 30,000 ft. -
Structure and Evolution of a Cumulonimbus Cloud Developed Over a Mountain Slope with the Arrival of Sea Breeze in Summer
Journal of the Meteorological Society of Japan, Vol. 84, No. 4, pp. 613--640, 2006 613 Structure and Evolution of a Cumulonimbus Cloud Developed over a Mountain Slope with the Arrival of Sea Breeze in Summer Tetsuya SANO and Kazuhisa TSUBOKI Hydrospheric Atmospheric Research Center, Nagoya University, Nagoya, Japan (Manuscript received 10 June 2005, in final form 4 April 2006) Abstract Cumulonimbus clouds frequently develop over mountains, a plain, and the sea in the summer in as- sociation with thermally induced local circulations. On July 5, 2000, when the sea breeze from the Pacific Ocean blew over the Noubi Plain and arrived at the slope of the Ibuki Mountains where a valley wind circulation developed, a cumulonimbus cloud occurred over the slope of the Ibuki Mountains. In this pa- per, the structure and evolution of the cumulonimbus cloud are investigated using the data of Doppler radars. The direction of the environmental vertical wind shear was southeast, which is parallel to the slope of the Ibuki Mountains, when the cumulonimbus cloud occurred. The cumulonimbus cloud maintained for about 2 hours. The cumulonimbus cloud consisted of groups of precipitating cells; ‘‘Primary Cell’’ and ‘‘Secondary Cells.’’ The former developed with tilting toward the downshear side and moved down the slope. The latter developed almost uprightly on the upshear side of the Primary cell. There were 6 groups of cells in the cumulonimbus cloud. The developing process and structure of group C, which was the most intense group, were investi- gated in detail. After Primary Cell C1, with tilting toward the downshear side, developed, Secondary Cells C2, C3 and C4 of group C developed on the upshear side (the Ibuki Mountains side) of cell C1. -
New Edition of the International Cloud Atlas by Stephen A
BULLETINVol. 66 (1) - 2017 WEATHER CLIMATE WATER CLIMATE WEATHER New Edition of the International Cloud Atlas An Integrated Global The Evolution of Greenhouse Gas Information Climate Science: A System, page 38 Personal View from Julia Slingo, page 16 WMO BULLETIN The journal of the World Meteorological Organization Contents Volume 66 (1) - 2017 A New Edition of the International Secretary-General P. Taalas Cloud Atlas Deputy Secretary-General E. Manaenkova Assistant Secretary-General W. Zhang by Stephen A. Cohn . 2 The WMO Bulletin is published twice per year in English, French, Russian and Spanish editions. Understanding Clouds to Anticipate Editor E. Manaenkova Future Climate Associate Editor S. Castonguay Editorial board by Sandrine Bony, Bjorn Stevens and David Carlson E. Manaenkova (Chair) S. Castonguay (Secretary) . 8 R. Masters (policy, external relations) M. Power (development, regional activities) J. Cullmann (water) D. Terblanche (weather research) Y. Adebayo (education and training) Seeding Change in Weather F. Belda Esplugues (observing and information systems) Modification Globally Subscription rates Surface mail Air mail 1 year CHF 30 CHF 43 by Lisa M.P. Munoz . 12 2 years CHF 55 CHF 75 E-mail: [email protected] The Evolution of Climate Science © World Meteorological Organization, 2017 The right of publication in print, electronic and any other form by Dame Julia Slingo . 16 and in any language is reserved by WMO. Short extracts from WMO publications may be reproduced without authorization, provided that the complete source is clearly indicated. Edito- rial correspondence and requests to publish, reproduce or WMO Technical Regulations translate this publication (articles) in part or in whole should be addressed to: An interview with Dimitar Ivanov Chairperson, Publications Board World Meteorological Organization (WMO) by WMO Secretariat .